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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27393 results found.

  1. GRB 981226 optical observations
  2. GRB 981220
  3. GRB 981220, radio observations
  4. GRB981220 I-band Observations
  5. GRB 981220
  6. GRB 980326/Host Galaxy
  7. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  8. BeppoSAX NFI Observation of GRB980425
  9. GRB980329 R,I flux calibration and R,I,K upper limits
  10. GRB980425 Optical Follow-up
  11. GRB 980923 BATSE Observations
  12. SGR1900+14, BeppoSAX-GRBM observations
  13. GRB970508 optical observations
  14. GRB971214, association with a Galactic star?
  15. GRB980519, Optical Observations
  16. GRB980703 - BeppoSAX/GRBM detection
  17. GRB980703 optical photometry
  18. GRB 980703: BATSE Observations
  19. GRB980703 optical observations
  20. GRB980703: Radio transient
  21. GRB 980703: Spectrum of the proposed optical counterpart
  22. GRB980703 Transient Optical Follow-Up
  23. GRB980703: LOTIS observation at early times
  24. GRB980613 Optical Observations
  25. GRB980703 (I band observations)
  26. BeppoSAX NFI observations of GRB 980703
  27. GRB980519 observation report
  28. GRB980703 optical followup
  29. Radio observations of SGRs
  30. SGR1900+14 field optical observations
  31. GRB980613, optical observations
  32. GRB 980613: Optical transient and its host galaxy
  33. SGR1627-41, RXTE/ASM observations
  34. GRB 980613: Detection of the probable host galaxy
  35. Reduced error box of SGR 1627-41
  36. GRB 980613: BATSE Observations
  37. GRB 980613 Optical Observations
  38. GRB 980613 optical observations
  39. Discovery of a new SGR source, SGR1627-41
  40. GRB980613 Optical Observations
  41. GRB980613 observations from Palomar
  42. GRB 980613 optical/IR obs.
  43. GRB980613 Near Infra-Red Observations
  44. GRB971214 Secondary Standards
  45. GRB980519 Secondary Standards
  46. BATSE on-board GRB trigger change
  47. GRB 980519 Optical Observations
  48. GRB 980519
  49. GRB980519 optical observations
  50. GRB 980519 Optical Observations
  51. GRB980519 BATSE Observations
  52. GRB980519 Optical Observations
  53. GRB980519 Optical Observations
  54. GRB 980519 Optical Observations
  55. GRB980515, BeppoSAX IAUC to be submitted
  56. BSAX Observations of GRB980425 field
  57. IPN web site of GRBs
  58. GRB980425 BATSE observations
  59. SAX J0840.7+2248 Optical Observations
  60. GRB980425: optical obs.
  61. GRB980425: Radio Observations
  62. report on BSAX observations of GRB980425
  63. GRB 980329 ROSAT observation
  64. GRB980326 X-ray Observations
  65. GRB980326, optical observations
  66. GRB980326, optical observations
  67. GRB980329, Fading IR counterpart to radio source
  68. GRB980329 Keck K-band observations
  69. GRB980329 sub-millimeter observations
  70. GRB980329 optical observations
  71. GRB980329 near-IR observations
  72. GRB980329 near-IR observations
  73. GRB980326 optical observations
  74. GRB980329 optical observations
  75. GRB980329 VLA observations
  76. GRB980329 optical observations
  77. GRB980329 optical observations
  78. GRB980326 optical observations
  79. GRB980326 optical observations
  80. Optical Observations of GRB 970508
  81. Near-IR follow-up on GRB 971227
  82. Optical Observations of the GRB 971227 field
  83. Optical Observations on GRB 971227
  84. GRB971227: Plaskett R-band observations
  85. GRB 971227: Optical clarifications
  86. GRB971227: Further CAHA R-band images
  87. GRB971227: LOTIS observations
  88. GRB971214: Optical Observations and Calibrations
  89. GRB 971214: Optical Observations
  90. Radio Observations of GRB 971214 at the VLA
  91. GRB 971024: Refined analysis by USNOFS Observations
  92. GRB 971024: KPNO Optical Observations
  93. GRB 970828: Palomar Observations

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